Sandvik Coromant 6868289 Turning Insert TCMT221-KF 3225

Product Description

The SANDVIK COROMANT 6868289 is a solid carbide turning insert in the CoroTurn 107 series, designed for precision metal-cutting operations on CNC lathes and turning centers. This TCMT-style insert carries a CVD-applied multilayer coating of TiCN, Al2O3, and TiN, which provides thermal resistance and wear protection across a range of cutting conditions. The insert features a 60-degree triangular geometry, a 0.0156-inch (1/64 inch) corner radius, and a 0.2500-inch (1/4 inch) inscribed circle diameter. The KF chip breaker geometry supports controlled chip formation. With three cutting edges per insert, this grade-3225 insert is engineered for productive, repeatable performance in turning applications. Licensed machinists, CNC operators, and tooling specialists are the primary users.

This insert is intended for turning cast iron workpieces, as indicated by its primary workpiece material code K. It fits standard TCMT toolholders with a screw-lock insert holding method and is part of the CoroTurn 107 series, which is designed for internal and external turning with through-coolant-compatible holders. The ISO designation for this insert is TCMT 11 03 04-KF 3225. Typical applications include finishing and semi-finishing passes on gray cast iron, ductile iron, and similar ferrous materials in production machining environments.

Key Features

• CVD multilayer coating: TiCN, Al2O3, and TiN for wear and thermal resistance
• KF chip breaker geometry for controlled chip evacuation
• 3 cutting edges per insert for extended tooling value
• 0.0156-inch corner radius for sharp, defined edge transitions
• Screw-lock insert holding method for secure, repeatable seating
• Rounded cutting edge style with clearance code C and tolerance code M

Compatibility

Designed for use in TCMT-style screw-lock toolholders within the SANDVIK COROMANT CoroTurn 107 series. ISO code TCMT 11 03 04-KF 3225 governs cross-referencing to compatible toolholder bodies. Confirms fit with any TCMT-accepting holder meeting the corresponding ISO geometry standard.

Installation Notes

Installation is performed by qualified CNC machinists or tooling technicians. Before changing inserts, power down the machine spindle and engage all axis locks per shop safety protocol. Seat the insert fully against the pocket locating surfaces before tightening the clamping screw; use the manufacturer-specified torx or hex key for the screw size on the toolholder body. Inspect the insert pocket for chips or debris before seating a new insert to avoid seating errors that affect dimensional accuracy.